"CO" in digital dash Fuel Gauge...

1989 Eddie Bauer Aerostar shows "CO" in digital dash Fuel Gauge after refueling to full. Does anyone know what this means?
Thanks, Rob * *
*
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Circuit Open. Fuel sender.
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Carbon Monoxide? Bad oxygen sensor maybe? Just guessing, don't know for sure, sorry. Tom F.

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CO = Circuit Open. This is caused by the fuel sender being extended beyond its reading range from a very (over) full tank. It should go away in a few miles of driving; if not, the float is stuck in the maximum position.
"Tom F." wrote:

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OK that is what is happening. What would cause this to start happening suddenly?
Rob * * *

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Your fuel sender is failing in that position. It's possible it will only fail here, it's also possible that it's a warning sign.
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